Uses the <ahref="https://www.npmjs.org/package/msgpack-lite">msgpack-lite npm</a> to pack and unpack msg.payload objects to <ahref="http://msgpack.org/">msgpack</a> format buffers.
**Note**: this node does not currently encode raw <code>buffer</code> types.
It will automatically try to *decode* any buffer received, and may not cause an error.